Votes cast in the district also counted towards the calculation of proportional representation ("plurinominal") deputies elected from the country's electoral regions.

[1][2] The 28th, 29th and 30th districts were abolished in the Federal Electoral Institute's 2005 redistricting process because the capital's population no longer warranted that number of seats in Congress.

[3] In its final form, when the capital comprised 30 districts, the 28th was located in the south-east of the city, covering the whole of the borough of Xochimilco.

[4] The districting scheme in force from 1978 to 1996 was the result of the 1977 electoral reforms, which increased the number of single-member seats in the Chamber of Deputies from 196 to 300.

[5] The 28th district covered portions of the boroughs of Azcapotzalco and Miguel Hidalgo in the north of the city.